Using LCDF-TEQ to Reduce CP Length for 20.48-Gb/s Direct Detection Optical OFDM Systems Over 1200 km of SMF

Author

Ghanbarisabagh, M.

Author_Institution

Dept. of Electr. Eng., Univ. of Malaya, Kuala Lumpur, Malaysia

Volume

49

Issue

2

fYear

2013

fDate

Feb. 2013

Firstpage

162

Lastpage

167

Abstract

In order to reduce the cyclic prefix (CP) length in direct-detection optical orthogonal frequency-division multiplexing (O-OFDM) over 1200 km of single-mode fiber (SMF), a low complexity decision feedback time-domain equalizer (LCDF-TEQ) is proposed. As a result, the residual inter symbol interference (ISI) and inter carrier interference (ICI) caused by both the group velocity dispersion (GVD) and the CP length being shorter than the channel impulse response (CIR) will be cancelled. The recursive calculation of channel matrix inverse reduces the computational complexity. Simulation results show that the performance of LCDF-TEQ is close to decision feedback time-domain equalizer (DF-TEQ) with a much lower complexity.

Keywords

OFDM modulation; decision feedback equalisers; intercarrier interference; matrix algebra; optical fibre communication; optical modulation; CIR; CP Length; GVD; ICI; ISI; LCDF-TEQ; O-OFDM; SMF; bit rate 20.48 Gbit/s; channel impulse response; channel matrix inverse; cyclic prefix; decision feedback time-domain equalizer; direct detection optical OFDM system; group velocity dispersion; intercarrier interference; low complexity decision feedback; orthogonal frequency-division multiplexing; residual intersymbol interference; single-mode fiber; Complexity theory; Integrated optics; OFDM; Optical feedback; Optical fibers; Optical receivers; Dispersion; equalizer; group velocity; optical orthogonal frequency division multiplexing (OFDM);

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.2012.2232644

Filename

6376081